Good luck to you.. I've been searching for years with no luck. The best ones ever, were Triad Toys Josh Randal. They we're perfect. You can try Battlegear toys or A.J. Clothiers. They have a few pair that might work... all depends what your looking for.
Ok, just thought of one more place... Monkey Depot has some Newline Miniature metal spurs. They look pretty nice. Very similar looking to the Josh Randall ones..